The billboard’s water-from-air machine (or atmospheric water generator)
will be a maximum of about 58% efficient at removing water vapour from
the air in February and March. In July and August, the machine’s
dehumidification efficiency drops to 39%. These efficiency values
presume that the chilled surface in the machine is maintained at 5°C.

The energy typically needed by dehumidifiers to condense water vapour into
liquid water is approximately 0.4 kWh per litre of product water.